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</style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr /><td align="left" valign="top" width="32"><img align="left" border="0" height="32" src="images/rb-logo.png" width="32" /></td><td width="1">&#160;&#160;</td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a>&#160;&#183; <a href="classes.html"><font color="#004faf">All Classes</font></a>&#160;&#183; <a href="modules.html"><font color="#004faf">Modules</font></a></td></table><h1 align="center">QDesignerCustomWidgetCollectionInterface Class Reference<br /><sup><sup>[<a href="qtdesigner.html">QtDesigner</a> module]</sup></sup></h1><p>The QDesignerCustomWidgetCollectionInterface class allows you to
include several custom widgets in one single library. <a href="#details">More...</a></p>

<p>Inherited by <a href="qpydesignercustomwidgetcollectionplugin.html">QPyDesignerCustomWidgetCollectionPlugin</a>.</p><h3>Methods</h3><ul><li><div class="fn" /><b><a href="qdesignercustomwidgetcollectioninterface.html#QDesignerCustomWidgetCollectionInterface">__init__</a></b> (<i>self</i>)</li><li><div class="fn" /><b><a href="qdesignercustomwidgetcollectioninterface.html#QDesignerCustomWidgetCollectionInterface-2">__init__</a></b> (<i>self</i>, QDesignerCustomWidgetCollectionInterface)</li><li><div class="fn" />list-of-QDesignerCustomWidgetInterface <b><a href="qdesignercustomwidgetcollectioninterface.html#customWidgets">customWidgets</a></b> (<i>self</i>)</li></ul><a name="details" /><hr /><h2>Detailed Description</h2><p>The QDesignerCustomWidgetCollectionInterface class allows you to
include several custom widgets in one single library.</p>
<p>When implementing a custom widget plugin, you build it as a
separate library. If you want to include several custom widget
plugins in the same library, you must in addition subclass
QDesignerCustomWidgetCollectionInterface.</p>
<p>QDesignerCustomWidgetCollectionInterface contains one single
function returning a list of the collection's <a href="qdesignercustomwidgetinterface.html">QDesignerCustomWidgetInterface</a>
objects. For example, if you have several custom widgets
<tt>CustomWidgetOne</tt>, <tt>CustomWidgetTwo</tt> and
<tt>CustomWidgetThree</tt>, the class definition may look like
this:</p>
<pre class="cpp">
 <span class="preprocessor">#include customwidgetoneinterface.h</span>
 <span class="preprocessor">#include customwidgettwointerface.h</span>
 <span class="preprocessor">#include customwidgetthreeinterface.h</span>

 <span class="preprocessor">#include &lt;QtDesigner/QtDesigner&gt;</span>
 <span class="preprocessor">#include &lt;QtCore/qplugin.h&gt;</span>

 <span class="keyword">class</span> MyCustomWidgets: <span class="keyword">public</span> <span class="type"><a href="qobject.html">QObject</a></span><span class="operator">,</span> <span class="keyword">public</span> <span class="type">QDesignerCustomWidgetCollectionInterface</span>
 {
     Q_OBJECT
     Q_INTERFACES(<span class="type">QDesignerCustomWidgetCollectionInterface</span>)

 <span class="keyword">public</span>:
     MyCustomWidgets(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>);

     <span class="keyword">virtual</span> <span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qdesignercustomwidgetinterface.html">QDesignerCustomWidgetInterface</a></span><span class="operator">*</span><span class="operator">&gt;</span> customWidgets() <span class="keyword">const</span>;

 <span class="keyword">private</span>:
     <span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qdesignercustomwidgetinterface.html">QDesignerCustomWidgetInterface</a></span><span class="operator">*</span><span class="operator">&gt;</span> widgets;
 };
</pre>
<p>In the class constructor you add the interfaces to your custom
widgets to the list which you return in the <a href="qdesignercustomwidgetcollectioninterface.html#customWidgets">customWidgets</a>()
function:</p>
<pre class="cpp">
 MyCustomWidgets<span class="operator">.</span>MyCustomWidgets(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent)
         : <span class="type"><a href="qobject.html">QObject</a></span>(parent)
 {
     widgets<span class="operator">.</span>append(<span class="keyword">new</span> CustomWidgetOneInterface(<span class="keyword">this</span>));
     widgets<span class="operator">.</span>append(<span class="keyword">new</span> CustomWidgetTwoInterface(<span class="keyword">this</span>));
     widgets<span class="operator">.</span>append(<span class="keyword">new</span> CustomWidgetThreeInterface(<span class="keyword">this</span>));
 }

 <span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qdesignercustomwidgetinterface.html">QDesignerCustomWidgetInterface</a></span><span class="operator">*</span><span class="operator">&gt;</span> MyCustomWidgets<span class="operator">.</span><a href="qdesignercustomwidgetcollectioninterface.html#customWidgets">customWidgets</a>() <span class="keyword">const</span>
 {
     <span class="keyword">return</span> widgets;
 }

 <a href="qtplugin.html#Q_EXPORT_PLUGIN2">Q_EXPORT_PLUGIN2</a>(customwidgetsplugin<span class="operator">,</span> MyCustomWidgets)
</pre>
<p>Note that instead of exporting each custom widget plugin using
the <a href="qtplugin.html#Q_EXPORT_PLUGIN2">Q_EXPORT_PLUGIN2</a>()
macro, you export the entire collection. The <a href="qtplugin.html#Q_EXPORT_PLUGIN2">Q_EXPORT_PLUGIN2</a>() macro
ensures that <i>Qt Designer</i> can access and construct the custom
widgets. Without this macro, there is no way for <i>Qt Designer</i>
to use them.</p>
<hr /><h2>Method Documentation</h2><h3 class="fn"><a name="QDesignerCustomWidgetCollectionInterface" />QDesignerCustomWidgetCollectionInterface.__init__ (<i>self</i>)</h3><h3 class="fn"><a name="QDesignerCustomWidgetCollectionInterface-2" />QDesignerCustomWidgetCollectionInterface.__init__ (<i>self</i>, <a href="qdesignercustomwidgetcollectioninterface.html">QDesignerCustomWidgetCollectionInterface</a>)</h3><h3 class="fn"><a name="customWidgets" />list-of-QDesignerCustomWidgetInterface QDesignerCustomWidgetCollectionInterface.customWidgets (<i>self</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns a list of interfaces to the collection's custom
widgets.</p>
<address><hr /><div align="center"><table border="0" cellspacing="0" width="100%"><tr class="address"><td align="left" width="25%">PyQt&#160;4.9.1 for X11</td><td align="center" width="50%">Copyright &#169; <a href="http://www.riverbankcomputing.com">Riverbank&#160;Computing&#160;Ltd</a> and <a href="http://www.qtsoftware.com">Nokia</a> 2011</td><td align="right" width="25%">Qt&#160;4.8.0</td></tr></table></div></address></body></html>